Add mastodon notificaiton, update message #490

	# https://help.github.com/en/categories/automating-your-workflow-with-github-actions

	name: "Backward Compatibility Check"

	on:
	pull_request:

	jobs:
	roave-backwards-compatibility-check:
	name: "Backward Compatibility Check"

	runs-on: ${{ matrix.operating-system }}

	strategy:
	matrix:
	dependencies:
	- "locked"
	php-version:
	- "8.3"
	operating-system:
	- "ubuntu-latest"

	steps:
	- name: "Checkout"
	uses: actions/checkout@v4
	with:
	fetch-depth: 0

	- name: "Install PHP"
	uses: "shivammathur/[email protected]"
	with:
	coverage: "pcov"
	php-version: "${{ matrix.php-version }}"
	ini-values: memory_limit=-1
	extensions: pdo_sqlite, bcmath, intl, sodium

	- uses: ramsey/[email protected]
	with:
	dependency-versions: ${{ matrix.dependencies }}

	- uses: ramsey/[email protected]
	with:
	dependency-versions: ${{ matrix.dependencies }}
	working-directory: 'tools'

	- name: "Check for BC breaks"
	run: "tools/vendor/bin/roave-backward-compatibility-check --format=github-actions --install-development-dependencies --from=origin/${{ github.base_ref }}"

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